Nickel oxide interstratified and pillared alpha-zirconium phosphate
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A novel nickel interstratified -zirconium phosphate (-ZrP) of approximate composition Zr(PO4)2Ni4(OH)5(C2H 3O2)2H2O has been synthesized by forming the nickel polymers in situ between the layers of zirconium phosphate to yield materials with d spacings ranging from 18.4 to 19.5 . X-ray powder structure refinement has shown that the resulting composite has unit cell dimensions a = 9.298(2), b = 5.389(1), and c = 37.61(5) , = 103.40-(2), Z = 4 and consists of layers of the original zirconium phosphate with two layers of nickel atoms bonded directly to the phosphate layers and a third layer of nickel hydroxide situated between the bonded Ni layers. Calcination of these materials led to a decrease in the d spacing of up to 4.7 to produce a nickel oxide three layers thick between the lamellae of the -ZrP. These composites have surface areas ranging from 63 to 158 m2 g-1 depending upon the temperature of calcination. Pore size analysis showed the materials to be predominantly microporous with pores of approximately 10 diameter. The compound exhibits ferromagnetic-like behavior. The idea that the ferromagnetism stems from formation of Ni0 particles is discussed. It has been shown that other cations, i.e., copper and cobalt, are able to form composites similar to those formed by nickel but without the formation of micropores. Mixed metal composites have also been prepared. 1999 American Chemical Society.
author list (cited authors)
Shpeizer, B. G., Sylvester, P., Cahill, R. A., & Clearfield, A.
complete list of authors
Shpeizer, BG||Sylvester, P||Cahill, RA||Clearfield, A